Can mood stabilizers affect your period?

This page is about hormonal treatments and SSRIs used for premenstrual mood, not psychiatric mood stabilizers like lithium or lamotrigine.

Hormonal treatments used for mood, like combined contraceptives, can shift mood in either direction. Which way depends on the person and the point in your cycle.

A placebo-controlled trial of 202 women found combined contraceptive use affected mood in two ways:

• Average anxiety, irritability and mood swing scores rose slightly during the pill-taking weeks
• Low mood in the days before bleeding eased

(Psychoneuroendocrinology, 2017). More broadly, past research cited in that trial's paper estimates that 4 to 10% of combined contraceptive users report depressed mood, irritability or anxiety as a side effect.

That's a real pattern, not something you're imagining if your mood changed after starting a hormonal treatment. It also isn't universal: many women feel steadier once they're on it.

Signs worth tracking if you've recently started or switched a hormonal treatment:

• Low mood that wasn't there before
• New or stronger anxiety
• Irritability that doesn't match your usual pattern
• Mood swings outside the week before your period

If any of these started within weeks of a change, mention it at your next appointment rather than waiting it out alone.

Hormonal treatments override your body's own estrogen and progesterone rhythm, and the brain doesn't always respond the way you'd expect.

Natural progesterone breaks down into allopregnanolone, a metabolite that acts on GABA-A receptors in the brain and has calming, anti-anxiety effects (Pharmaceuticals, 2023). Synthetic progestins in contraceptives don't all behave the same way once absorbed. That may explain why some women feel calmer on a hormonal treatment and others feel worse.

PMDD itself seems linked to lower estradiol levels in the second half of the cycle, based on a meta-analysis of more than 5,000 women (Frontiers in Neuroendocrinology, 2021). Across PMDD research more broadly, the clearer finding is that PMDD is a different reaction to normal hormone changes, not abnormal hormone levels (Schmidt et al., 1998, NEJM; Dubey et al., 2017, Molecular Psychiatry).

That distinction shapes treatment. The goal is usually to calm a brain that reacts strongly to ordinary hormone swings. That's also why the same contraceptive or progesterone dose can settle one woman's mood and unsettle another's.

Most trials only track mood for a few menstrual cycles, so there's no single, settled timeline.

What longer data exists is reassuring. Over two cycles, women on oral contraceptives reported fewer mood swings between depression and elation in the mid-luteal phase, and fewer ruminating thoughts, than naturally cycling women (Journal of Psychosomatic Research, 2017). That suggests OC-users as a group report less mood swinging than naturally cycling women over two cycles, though this doesn't tell us how any one woman's mood changes after she starts.

That doesn't mean every rough start resolves on its own. If anxiety or low mood shows up and stays through two or three cycles, that's useful information for a doctor, not a reason to push through alone.

Some of the same hormone pathways that cause side effects for one person ease PMDD symptoms for another. The research on severe premenstrual mood symptoms is more encouraging than the general contraceptive data above.

Option	What it does	Evidence so far
Transdermal estrogen (patch, gel, implant)	Stops ovulation and the cyclical hormone swings behind PMS and PMDD symptoms	Moderate: Cochrane review of 305 women
Estradiol plus progesterone add-back	Buffers the hormone drop around your period	Promising: small crossover trial on severe perimenstrual mood symptoms
Selective progesterone receptor modulator (ulipristal acetate)	Blocks progesterone receptors while keeping estradiol at a moderate level	Mixed: earlier trials reported eased PMDD symptoms; a newer imaging trial found no matching change in brain white matter
SSRIs, including luteal-phase-only dosing	Adjusts serotonin signaling in the brain	Guideline-recommended first-line option; a doctor decides timing and dose

None of these cure PMDD. They're options a doctor weighs against your history, not something to start or stop on your own. For a closer look at how they hold up specifically for PMDD, see mood stabilizers for PMDD. A related pattern shows up closer to perimenopause too: see mood stabilizers for perimenopause mood.

If a hormonal treatment seems to be changing your mood, you don't have to guess. A few steps help separate what's hormonal from what's something else.

1. Track your mood daily against your cycle for at least two cycles, using something like the DRSP chart.
2. Check the timing. Symptoms all month point to something other than PMS or PMDD; symptoms mostly in the week before your period point to one of those two. See what PMS is for the difference.
3. Bring your notes to your doctor if a treatment seems to be making things worse, rather than stopping it on your own first.
4. Ask about switching the hormone type or dose, trying a non-hormonal option, or adding back hormones if you're on something that suppresses ovulation.
5. If the usual options haven't fit, a PMDD specialist can go further into which approach matches your pattern.

Smaller studies point to other supports worth asking about. Yoga eased depression scores and lowered diastolic blood pressure in a trial of 62 women with PMS (Complementary Therapies in Clinical Practice, 2019). For more on what helps day to day, see PMS treatment: what actually helps.

Niyora is a PMS and PMDD support app. If you want to separate hormone noise from what actually happened before you decide what to do about it, Niyora's Moon lets you write down the moment, see it from another angle, calm down, and draft a reply you can hold onto for twenty minutes.